How severe is CVE-2021-4103?

CVE-2021-4103 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-4103 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4103?

CVE-2021-4103 affects B3log Vditor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4103?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-4103 published?

CVE-2021-4103 was published on 2022-01-23 and last updated on 2026-06-17.

CVE-2021-4103

CVE-2021-4103 is a medium-severity vulnerability in B3log Vditor with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: B3log Vditor
Published: 2022-01-23
Last modified: 2026-06-17

Description

Cross-site Scripting (XSS) - Stored in GitHub repository vanessa219/vditor prior to 1.0.34.

Frequently asked questions

What is CVE-2021-4103?: Cross-site Scripting (XSS) - Stored in GitHub repository vanessa219/vditor prior to 1.0.34.
How severe is CVE-2021-4103?: CVE-2021-4103 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-4103 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4103?: CVE-2021-4103 affects B3log Vditor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4103?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-4103 published?: CVE-2021-4103 was published on 2022-01-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:b3log:vditor:*:*:*:*:*:*:*:*

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